CVE-2016-9736 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere Application Server using malformed SOAP requests could allow a remote attacker to obtain sensitive information.
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Analysis
by VulDB Data Team • 12/26/2020
IBM WebSphere Application Server contains a vulnerability in its SOAP message processing implementation that allows remote attackers to craft malformed SOAP requests to extract sensitive information from the affected system. This vulnerability specifically affects the server's handling of malformed SOAP messages, where the application fails to properly validate or sanitize incoming SOAP payloads before processing them. The flaw stems from inadequate input validation mechanisms within the WebSphere SOAP processing framework, which does not adequately protect against specially crafted malicious SOAP requests designed to probe system internals. When a malformed SOAP request is processed, the server may inadvertently expose internal system information, configuration details, or sensitive data through error responses or diagnostic information. This vulnerability falls under the CWE-20 category for Improper Input Validation, specifically manifesting as a weakness in the validation of SOAP message structures and content. The attack vector operates over network protocols and requires no authentication to exploit, making it particularly dangerous as it can be leveraged by any remote attacker with network access to the affected WebSphere instance. From an operational impact perspective, this vulnerability represents a significant information disclosure risk that could lead to further exploitation attempts, including credential harvesting, system architecture reconnaissance, or privilege escalation opportunities. The potential for cascading attacks increases when attackers can gather sufficient information about the underlying system to plan more sophisticated attacks against other components within the same environment.
The vulnerability demonstrates characteristics aligned with ATT&CK technique T1083 (File and Directory Discovery) and T1046 (Network Service Scanning) as attackers can use the information disclosure to map system resources and identify potential attack vectors. IBM WebSphere Application Server versions prior to 8.5.5.15 and 9.0.0.0 are affected by this issue, with the problem residing in the SOAP message parsing and validation logic. The root cause involves insufficient sanitization of SOAP envelope structures and header elements, allowing malicious payloads to trigger information leakage mechanisms within the application server. Security researchers identified that when malformed SOAP requests are sent to the server, the processing logic does not properly handle exceptions or invalid message structures, resulting in verbose error messages that contain system-specific details. These error responses can reveal directory structures, internal server configurations, database connection information, or other sensitive system artifacts that would normally be protected from external access. The vulnerability is particularly concerning because it operates at the application layer and can be exploited through standard HTTP or HTTPS connections, making it accessible through common network reconnaissance tools and automated attack frameworks. Organizations running WebSphere servers without proper patching or network segmentation are at heightened risk of information disclosure attacks that could compromise their entire application infrastructure.
Mitigation strategies for this vulnerability include applying the official IBM security patches released for WebSphere Application Server versions 8.5.5.15 and 9.0.0.0, which address the SOAP message validation issues. Network administrators should implement proper firewall rules and access controls to limit exposure of WebSphere instances to untrusted networks, particularly blocking unnecessary SOAP endpoints. Additionally, organizations should consider implementing web application firewalls that can detect and block malformed SOAP requests before they reach the application server. Input validation should be strengthened at the application level, with proper sanitization of all SOAP message content and implementation of robust exception handling mechanisms. Security monitoring should be enhanced to detect unusual patterns of SOAP requests or error responses that might indicate exploitation attempts. The vulnerability also highlights the importance of regular security assessments and penetration testing to identify similar issues in other application server components or custom SOAP implementations within the organization. Organizations should also implement proper logging and audit trails to monitor SOAP message processing activities and detect potential exploitation attempts. From a compliance perspective, this vulnerability could impact organizations subject to standards such as pci dss, iso 27001, or soc 2, as information disclosure issues often represent security control failures that could lead to regulatory violations or audit findings. Proper network segmentation and principle of least privilege access controls should be implemented to limit the potential impact should an attacker successfully exploit this vulnerability or similar issues in other system components.